Work removing apparatus for presses



March 10, 1942.

WORK REMOVING APPARATUS FOR A PRESS Filed Sept. 19, 1940 3 Sheets-Sheetl x h c .J 5 [I' l]! I h" Ill" W I" W H. SAHLIN 2,275,561

March 10, 1942.

H. SAHLIN WORK REMOVING APPARATU S FOR A PRESS s Sheets-Sheet 2 FiledSept. 19, 1940 INVENIOR.

H. SAHLfN 2,275,561

Filed Sept. 19, 1940 3 Sheets-Sheet 5 WORK REMOVING APPARATUS FOR APRESS March 10, 1942.

b .4. WWW Q\ Patented Maia-1Q, 1942 2,275,561

UNITED STATES PATENT OFFICE WORK REMOVING APPARATUS FOR PRESSES HenrySahlin, Detroit, Micln, assignor to Genera] Motors Corporation, Detroit,Mich., a corporation of Delaware Application September 19, 1940, SerialNo. 357,453 Claims. (Cl. 113-50) This invention relates to materialhandling and in Fig. 1, where the work is designated W. As

, has for its object material ejecting apparatus the ram rises, theknock-out portion 5 of the designed to be used with metal stampingpresses female die rises relatively to the lower die (as and to beautomatically operated by the press is shown in Figs. 2 and 3). Thisknocks out and particularly by the up and down movement 5 or releasesthe work W. As the ram rises, the of the ram of the press. cam 24strikes the trip arm 25 that controls the Referring to the drawings:fluid valve 26. This allows fluid to pass through Fig. 1 is a sideelevation of the apparatus pipe 2| to the left end of cylinder l9,causing shown in connection with a press, the latter p st to travel to te right own in being shown in a sketchy diagrammatic way. 10 Fig. 5).This causes the open jaws II and I2 'Fig. 2 is a similar view of theapparatus after to straddle the edge of the work which has been the workhas been released from the die and knocked out of the' lower die (asshown in Fig. the apparatus has gripped the work. 2). As the jaws arepushed to the right to Fig. 3 is a similar view of the apparatus asstraddle the work, the upper arm 28 of the bell the same is in processofpulling the work out crank lower arm ll strikes the shoulder 21 at ofthe press. i the end of the arm l5. This causes the lower Fig. 4 is adetail view of the gripping arm, jaw to revolve on pivot l6counter-clockwise and together with the gripping jaws in open position.thereby the la s are brought ogether to g Fig, 5 is a similar viewshowing the jaws in the work. As the ram rises, the projecting rollerclosed position, 29 strikes the upper end 30 of the pivoted arm 6. Fig.6 is a section on the line 6-6 of Fig, 5, This has a cam surface 3|adapted to ride along I designates the rain of the press and 2 desigt ro29 and the arm is Caused t0 Swing nates the bed'of the press. The ram isprovided out o h dotted line position wn in i 3 with a suitable punchingdie 3 and the bed of where the arm is over the traveling conveyor thepress with a suitable female die 4. This has 3 At this p n the p arm dps ff cam a portion 5 which acts as a knock-out or release 2 n h id f has wn by he dotted at the proper time. The usual knockt; pins lineposition A in Fig. 3. This allows the spring may be substituted for thisarrangement, A 33 to return the fluidcontrol valve to the releasedknock-out, however, is not always required beposition and allows the airto exhaust through cause in some instances the work hand itself the a asShown by the arrows n Figs. 1 and can be used as a knock-out device, 3.Spring 20 returns piston l8 to the left hand A heavy pendant arm 6 ispivoted at 'l and, position (as shown in Fig. 4) and the jaws sepa-'when not actuated, swings down to the vertical rate (as Shown in 4 nd ndotted lines in position how at a i Fi 3, a, stop 9 being Fig.3). Thisdrops the work onto the conveyor provided to prevent its overswingingagainst the 32 Which is Continuously o press. This arm carries the workgripping arm It is poss y altering t Cam Surfaces, to I 0 which isprovided with tw jaw H a d I2, swing the arms 6 out to substantiallyhorizontal each provided with a toothed or serrated gripposition wherethe work will bedropped in such ping piece I3 removably secured in placeby away that it inverts itself, if this be desired. screws II. The upperjaw is arranged to slide 40 I claim:

in the guideway IS on the arm Ill. The lower 1. In an apparatus forremoving work from a jaw is in the form of a bell crank lever and ispress or other like machine, the combination pivoted at l6 to thesliding upper jaw member. with two relatively movable members such asThe sliding upper jaw is connected to the end the ram and bed of apress, a swinging pendant of a piston rod I! which, in turn, isconnected mm supported at the side of the machine and to piston l8 thatslides in cylinder I 9. Spring having at its lower end a pair of jawsfor grip- 20 tends to keep the piston to the left of its ping the work,the movable member of the mastroke. Pipe 2| connects with the left handend chine arranged in its upward movement to cause of the cylinder. Pin22 holds the bell crank the pendant arm to swing upwardly and outleveror lower jaw member II in the open posi- 5O wardly into a position awayfrom the press and tion shown in Fig. 4. means for causing the jaws togrip the work be- The operation of the machine is as follows: fore thearm swings upwardly and to p the A piece of sheet metal having been putbetween work free from the press as the pendant arm the dies, the ram ofthe press is caused to descend reaches the outward end of its movement,in the usual way and stamps the metal, as shown 2. In an apparatus forremoving work from a arranged in its upward movement to cause thependant arm to swing upwardly and outwardly into a position away fromthe press and means for causing the jaws to grip the work before the armswings upwardly and to drop the work free press or other like machine,the combination with 4 two relatively upwardly and downwardly mov ablemembers such as the ram and bed of a press, a swinging pendant armsupported at the from the press as the pendant arm reaches the outwardend of its movement, the said last men tioned means comprising a pistonand cylinder connected with the jaws for operating the jaws, saidcylinder furnished with fluid automatically controlled by the movementof the movable member of the machine.

3. In an apparatus for removing work from a press or other like machine,the combination with two relatively upwardly and downwardly movablemembers such as the ram and bed of a press, a swinging pendant armsupported at the side of the machine and having at its lower end a pairof jaws for gripping the work, the movable member of the machinearranged in its upward movement to cause the pendant arm to swingupwardly and outwardly and means for causing the jaws to grip the workbefore the arm swings upwardly and to release the work as the pendantarm reaches the outward end of its movement, the said last' mentionedmeans comprising a pair of jaws which slide with respect to the arm andone of which is pivoted to the other and provided with an arm portionarranged to be tripped by a shoulder, a piston and fluid cylinder withthe piston connected to the sliding jaws to cause the jaws to advanceupon the work and straddle the same and the pivoted jaws with the triparm arranged to engage a shoulder on the pendant arm to cause thepivoted jaws to close one upon the other and upon the work and fluidcontrol means controlled by the movement of the movable member of thepress.

4. In an apparatus for removing work from a fill side of the machine andhaving at its lower end a pair of jaws slidable at a unit on the arm andfor gripping the Work, the movable member of the machine arranged in itsupward movement to cause the pendant arm to swing upwardly and outwardlyand means for causing the jaws to move independently of th arm tostraddle the work and to grip the work before the arm swings upwardlyand to release the work as the pendant arm reaches the outward end ofits movement, the said last mentioned means including a fluid cylinderand piston for causing the jaws to slide with respect to the arm toclose upon the work and to release the work and a fluid valvesupportedadjacent the side of the machine and having a trip arm and a cam on themovable member of the machine for engaging the trip arm to control thevalve which controls the fluid to the piston.

57 In an apparatus for removing stampings from a press, the combinationwith a machine having a bed and a movable ram having a trip member of apendant arm pivoted at its upper end and having a portion of the upperend of the arm forming a cam surface to be struck by the member on theram to swing the arm and the work out from th machine. the lower end ofthe arm extending at an angle to the pendant portion of the arm andslidable jaws slidable on said arm end and one pivoted with respect tothe other and a fluid cylinder and piston for advancing the jaws to astraddling position on the work and one of the jaws pivoted and providedwith a trip portion adapted to engage a stationary portion of the armwhen the jaws have been slidably advanced to the straddling position tocause the jaws to close upon the work and a valve in proximity to theram and controlled by the movement thereof to regulate the nuid'supplyand the exhaust from the fluid cylinder.

HENRY SAHLIN.

